Hello,

I'm looking into upgrading our Unity runtime from 3.8 to 4.0-2021-08-16, and I'm having trouble importing the re-exported characters that I exported with Spine Pro 4.0.23. Some of our spine characters import fine, but the more complex ones don't load in unity and give the error:

Error reading skeleton JSON file for SkeletonData asset: cha_littlePeople_SkeletonData
Error reading animation: torch_animations/anm_walk_torch
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at Spine.SkeletonJson.ReadSkeletonData (System.IO.TextReader reader) [0x01393] in C:\isaac\mm-bitbucket\ce2-console\Assets\Plugins\Spine\Runtime\spine-csharp\SkeletonJson.cs:368
at Spine.Unity.SkeletonDataAsset.ReadSkeletonData (System.String text, Spine.AttachmentLoader attachmentLoader, System.Single scale) [0x00017] in C:\isaac\mm-bitbucket\ce2-console\Assets\Plugins\Spine\Runtime\spine-unity\Asset Types\SkeletonDataAsset.cs:258
at Spine.Unity.SkeletonDataAsset.GetSkeletonData (System.Boolean quiet) [0x000c4] in C:\isaac\mm-bitbucket\ce2-console\Assets\Plugins\Spine\Runtime\spine-unity\Asset Types\SkeletonDataAsset.cs:173
UnityEngine.Debug:LogError (object,UnityEngine.Object)
Spine.Unity.SkeletonDataAsset:GetSkeletonData (bool) (at Assets/Plugins/Spine/Runtime/spine-unity/Asset Types/SkeletonDataAsset.cs:176)

I've emailed one of the exported characters to contact@esotericsoftware.com - please can you look and let me know if this is a bug or an issue with our export settings? I've tried the usual tricks of deleting and re-exporting/importing of course, including with a brand new unity project and a fresh spine import. I'm using Unity 2020.3.14f1.

Thanks,
Isaac